Valve mechanism



July 17, 1928. 1,677,460

A. w. POPE, JR .u

VALVE MECHANI SM Filed July 2'1, 192e l Patented July 17, 1928.

l* vu lal'rglszn STATES PATENT OFFICE.

' 'i ARTHUR W. Porn, JR., OF WAUKESIIA, WISCONSIN, nssIGNOR v'ro WAUKEsHAI/IOTOR CO., or WAUKnsHA, WISCONSIN, ACORIORATION on WISCONSIN.

VALVE MECHANISM,"

Application led July 21,

particularly to sleeve valve mechanism for internal combustion engines, and the object of the invention is to provide more practical means for sealing the joint between the valve"sleeve and'` the. cylinder against gas leakage during the compression and firing strokes. .'1 Y

- In Aorder `to Iei'ect sealingagainst -the esing strokes packing strips or 'rings have beenv used with the rotary valve, but such strips or rings have been in such shape and.v form that practical and simple manufacture thereof is almost impossible.

In accordance with my invention, I utilizev elliptical packing strips or rings which can be practically and inexpensively produced by'obliquely cutting or slicing a hollow cyl inder or. tubing. Suchcutting or slicing can be 'readily accomplished with simple machinery. VThese sealing rings are then applied in the engine frame in a plane at an angle to the cylinder axis and with the outer cylindrical surface of the ring exposed to the inner side of the valvel sleeve. The various ports are shaped and proportioned to l cooperate With the ring to effect the proper sealing during the compression and ring strokes.

On the drawing;

Fig. 1 is a vertical diametrical section of the upper part of a cylinder structure;

Fig. 2 is a sectional view on plane 2-2 of Fig. 1; Y

Fig. 3 is a diagrammatic developed view showing the relation and cooperation of the various ports; and

Fig. 4 shows the manner of cutting the sealing rings from tubing.

The cylinder frame 10 is surrounded by the water jacket 11, and has secured in its upper end the head frame 12 which'forms the combustion chamber 13 surrounded yby the water space 14. The sleeve valve 15 is interposed between the head frame and the cylinder wall and in its lower end the piston 16 reciprocates, the piston at its upper end being surrounded-by the packing ring 17. The head frame has in its top, the axial threaded opening 18 for the insertion of a spark plug (not shown).

The sleeve valve is rotated during operation of the engine, and as rotary valve engines are well known in the art the means cape vof gases during the compression or ir- 1926. Serial Nolv 123,968.

the drawing. Thesleeve has theport 19 which cooperates consecutively with the intake port 20 and the exhaust port 2,1, said intake and exhaust ports beingin the :head frame 12 and together take up about 180o of the circumference of thehead frame, the

forrotating the valverhas been omitted from I frame at' the other 1800.01 its wall being closed to the valve port, the compression and firing .strokes of the engine taking place during travel of the valve port through this arc [of itstravels. Duringthe compression strokes and the firing strokesthe combustion chamber is under considerable pressure and the' gases unless restrained will leak out through thelvalve port andbetween the valvewall andthe cylinder frame walls.

To reduce or eliminate such leakage, a piston ringfstructurehas been `interposed between the cylinder' head and thevalvesleeve and positioned sothat 'during the compression and iring strokes the valve port `will be above the sleeve packing or sealing ringV .and thus sealed or isolated from'the com. bustion chamber. The only escape for the gases then would be either past the piston sealing ring or the valve sealing ring. The valve sealing ring structures heretofore used have been of a form and shape which is iinpractical and expensive from amanufa'cturing standpoint. Instead of using a sinuous, helical, or other impractical shape, I use a packing ring 22 of elliptical shape. As shown in Fig. 4 such rings are readily produced by cutting or slicing a tube A Obliquely, such slicing or cutting being readily performed by means of saws or other simple tools or machinery. y

As best shown in Fig. 1 the packing ring is retained within a vgroove 23 in the cylin- I der head and lies in a plane at an angle with the cylinder axis and with its outer cylindrical surface in engagement with the inner surface of the valve sleeve. In the arrangement shown, the plane of the ring is at an'l sponding to the positions shown in Figs. 1

and 2. The intake and exhaust ports are belo-W the upper 180 degree section of the sealing ring and the sleeve valve is, carrying iteport :21 :lacross the mexhaust port, the

y above the lower` 180 degree sectionffofthe segments.

'take sleeve valve rotating in the direct/ion of'the arrow Shown in Fig. f2. As the sleeverotartes, its port -Will V,come .into registration Wit-h theintke rt QOHeQn'dthevxatlvel4 ort will then be carrledinto the spate Whic is sealing ring and itl will remain in this space during the eonipression-ntrilig etrokesfo the enginey so as to be sealed from the combustion rhamber. Y Affter fthe 'iringstrokes the vulve yport entei'sitheupper 18d-degree stretch of the sealin-gvringto'first-register with the exhaust-portant] then With-:timinort. l Aspbefore stated, thesestling ring being unipl'anar, it `can fbe 'readily 'manufactured Y accurately. :It isevidentithft my improved ring, like the ordinarypressure packing ring, can 'be made of one piece, orofflaminetionfor Having described 'my invention, 'I `claim the `following: f

1. 'Infan engineythe combination-of -a oyl!V inder'lhaving .a combustion chamber, nii-@tary .valve having fa lport adapted to :communicate fwith safid combustion chamber during the intake and vexhaust f strokes of Ithe lengine, :mdf afuniplanurasealingfring eng-aging said' valve,'tl1e=plzme offsaidringfbeing lut. an angle with the cylinder axis Vand'thelrin'g be'- 90 degrees with the axis of the eylnden whereby/Said port WilLpass entirelfyfrom one side'y ofV the lring 2 to the otheiwasV the :Sleeve is l rotated.

3. In 1 combination, f a roylinder, faff'cylinder head i forming' afvcombn'stioni chamber, avnlve sleeve between said head and eylinderwfall's, saidnvulverhaving La port, intakeiandQeXha-ust portswhoseeonn'ection with the-combustion chamber is 'controlled byosaidv-alveport, and

a! uniplanar lsealing.ringlbetvveen said head and sleeve: :and positioned' with itsiplane `t-,Lan

angle with the 1 Cylinder axis', said 'ring .ibe-V ing disposed belowsaid valve port toesea'l said port'from said eombnstionfehamber dnring compression .and lirin'gistrokes uof'the cylinderpiston. Y o

v7`In :witness whereof, I' hereunto :subscribe my nfameithis i'l dayfofJu1y,;l926.. v 4,ARTHUR W.;POPE,-.J&:. I 

